Low-Temperature Ferromagnetic Order in a Two-Level Layered Co2+ Material

© 2024 The Authors. Published by American Chemical Society.

Bibliographische Detailangaben
Veröffentlicht in:Chemistry of materials : a publication of the American Chemical Society. - 1998. - 36(2024), 17 vom: 10. Sept., Seite 8208-8216
1. Verfasser: Doheny, Patrick W (VerfasserIn)
Weitere Verfasser: Stenning, Gavin B G, Brookfield, Adam, Orlandi, Fabio, Collison, David, Manuel, Pascal, Carr, Sam T, Saines, Paul J
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2024
Zugriff auf das übergeordnete Werk:Chemistry of materials : a publication of the American Chemical Society
Schlagworte:Journal Article
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520 |a The magnetic properties of a 2D layered material consisting of high-spin Co2+ complexes, [Co(NH3NH2)2(H2O)2Cl2]Cl2 (CoHyd 2 Cl 4 ), have been extensively characterized using electron paramagnetic resonance, magnetic susceptibility, and low-temperature heat capacity measurements. Electron paramagnetic resonance spectroscopy studies suggest that below 50 K, the J = 3/2 orbital triplet state of Co is gradually depopulated in favor of the J = 1/2 spin state, which is dominant below 20 K. In light of this, the magnetic susceptibility has been fitted with a two-level model, indicating that the interactions in this material are much weaker than previously thought. This two-level model is unable to fit the data at low temperatures and, combined with electron paramagnetic resonance spectroscopy, suggests that ferromagnetic interactions between Co2+ cations in the J = 1/2 state become significant approaching 2 K. Heat capacity measurements suggest the emergence of a long-range ordered state below 246 mK, which neutron diffraction confirms to be ferromagnetic 
650 4 |a Journal Article 
700 1 |a Stenning, Gavin B G  |e verfasserin  |4 aut 
700 1 |a Brookfield, Adam  |e verfasserin  |4 aut 
700 1 |a Orlandi, Fabio  |e verfasserin  |4 aut 
700 1 |a Collison, David  |e verfasserin  |4 aut 
700 1 |a Manuel, Pascal  |e verfasserin  |4 aut 
700 1 |a Carr, Sam T  |e verfasserin  |4 aut 
700 1 |a Saines, Paul J  |e verfasserin  |4 aut 
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